Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66d3ed90c0f9cc019d68d5bcd9a600d981c23f05289ceaeacc1eae8f8d362906' 
  AND token = 'NE454Fxi4+kPry0mR5jlhbQaWaA8ohDmAkVQGPNiDuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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