Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f726dca53a88684548169d8add43934f2b90d7581fd21979b878dba635574732' 
  AND token = 'Zmud2Qvd19qFVR8q9UE79B+K37XXz0jVHlUZ+ebNyAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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