Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817197ca876a7736162cfe2b858806992a1a327009ef70d8c2d6c8484c6defcd' 
  AND token = 'CFzmhmVXDu+ksL24kDALdKl3k4CuPR5jH1cyZv6e96k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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