Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42ace15eba71e0ee4641383ff68bb8ae26ab369a80a7dc32aa28055f5d282f3' 
  AND token = 'eVSs4/7cgXwFoZ0mwZHBU4eo5JtOksdfSXG8J+yhD7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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