Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e6a51a202547a6916f3fe143c3bd1336bfc9376a236b2e8c5d9b1de7a1ecf7' 
  AND token = 'f1AOizhD8sEgPQFb+ip4WqlzS0sD0M4Kavl3FqS/c/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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