Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ed80c1e85e8214723b4725eca16b898ffd55603d7780b1ab6292aba382a72b' 
  AND token = 'd3pLexYorC66FzntN77xyfRj96CvsIm1wN5QWsstMjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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