Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91a8077e6576d64b6721ab08b0cb475169e6eea53649b732f665d75686a09bf' 
  AND token = 'ZpOJZNTEWg+v5LlCmMyPNNOCaKUqVZeEFFgnZiJpeaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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