Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7503214fc32c83b5accee9e23d33cd0103aa9a6506bc98d7192ef253d994d86b' 
  AND token = 'kMSNcaPH6PdEbFU8URtul4OZmAdCKsMeUhpEZSqokA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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