Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ef1ecf912e96c78c96a329a59d2c455d3406329e259236e9a084e5e3764b1520' 
  AND token = 'F0QddQ6KYYm2rtBTTONyK4rIC76TAQ2yTyqrkBHroJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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