Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45cd5037ab480cf4c252e7c217432d69b764600e3446117b704085719ed246b' 
  AND token = 't0vdd8wNSQZ6MG3YhrPzmxdI2lTY1SE8XeQjRZWZwCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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