Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3690d0ad89e2fa07739e830073a9966cb228f69b895f1da100d9d8c864c74f2' 
  AND token = 'RKNsZjFfJczCujJujXDJDf/K/y4lIX/W91UBmsEf9qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}