Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c786c10629bc2b1f4c28ffb4cce071bc63846d846c783577fcba0dac9843fc' 
  AND token = 'j5g2YrPpD+rpS6k2bxHirFB9/K0uLxtHgGLQl1oVak0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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