Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c72fc0d611adc90c73a8cdb5452c0974cfc708a9830e958c9bee0703b200f1' 
  AND token = 'T0S+vypgnQd3mkdFIWcmkOiPWUn6Hy6M4fnB2w1gYbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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