Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a7b759b612c79664e5fbe03b8a490b6a2d62d5cafe498600be333a249d57ca' 
  AND token = 'qqyAqeYo9sjx2BA/P6WWc78CxsgLtpzO3FZMlBA6NrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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