Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8cacca3df83a8c691fc13cdf2eac3486a06c8ebaf7a14c0fd6c406c7929fdbb' 
  AND token = 'bAjkPnp5U79OfJBld9rDcS2aND8D0xqE/wjSgz010mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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