Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dab3868cf96f5276f8c44d17af479c9ec4b2fcb52fe18aa1e2a18b3feddbe3a' 
  AND token = 'ggRPEaRUb1D2IyeARxip6rD58i5NuUpCWvzAY/O3SmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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