Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8e39ea196b33a03d06a5b1adea7daafb0f17483bb79101a14f8b044d982a45' 
  AND token = 'inGFs0Y7jOvuQXBQep+j/bFOSxPBFbXYfpdCMEf9kvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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