Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef91c30deae9e25da9dd848d04c7ce7d82c3c5ce93527fc36c9c18cbf6dde9b' 
  AND token = 'arkAbJoJgDStPuwqIK4ZVps7Aj9dklGCXcxE/ZVf4YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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