Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3678f2e5616fb4531b48ce9d2206d9c4a76f21eecfe96a3a1636c5824522a56c' 
  AND token = 'rxU7RuiqrobejEpT9WgoPtArWhICJQbQ+I2imM2GKME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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