Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde41ee1cdee5031ebedb00101d13a276ffb23e2e18c6da6423ec2562ef26b27' 
  AND token = 'vcRGPX/oZ9ZzOTLw+nYX0QQG9gjYP1vL/fjDaEZOGP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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