Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34a5e748c38087e1ba13133bb7acdd1a7141bf3182683c3ad7995aa87ea03c53' 
  AND token = 'ooBjA0dJVKvWxtuvy9WhT4BRRN/QhUF+juVCZYOT1BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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