Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356e29d69cdceca53df9027e6012b8d1e0152610666e4506ebb0819de028fd51' 
  AND token = 'AKvfx4i3lXSjC0FEviED9toUNrTwc3IePlJgrqVJk7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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