Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c8ebaaca987e76951930abcafe8350fb56ddc69bf3c7bd4f1940df8818d25b' 
  AND token = '7ELb4dkti6XitXh0Fm+1Z7Qer/Sr/IVV0RhQ/f8pr2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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