Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3907373ebacd7aff7717c5c2035e9718c6b439196076975cd446e7415e82bfa8' 
  AND token = 'IgQEWKKiLZt8VWblpV1cOG439W1VzE8kP5gTLLWyg0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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