Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cfa0a4a02cf265629806751649d38450c8e7a3d90bb8dfdbc2f760c50cb458' 
  AND token = 'evSM2HfYoDi28yRrxyY2fqTCJlm4gNVKFFTWDfL1QRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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