Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e131dc196eac4080bc4758bd50dc0651b9be32a18c94651ec23e4b5e02ef46f' 
  AND token = 'OFNCf3R+OJLKmWTc8i78lcaKlSgkdFjiRi0fhTT6kfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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