Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f633ff25aa86b9f96e45af50d1cbbc331e815bd0b0e57a7c38457d4a240087da' 
  AND token = 'UvykH0PUDcgg8LHKh+v/wSkuDcNUMw8t6mHhJb5kfvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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