Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8fb27b3ebb8da675f8e2a626f2c2cbe455ec45b88c8092bfc892649698c33d' 
  AND token = 'eNWn9S9Np3mkzXvzsc8SeGIW/koNp/G3Iabm9WnQqnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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