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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '679952d8ae67a02d916483bf1c9ac29538bf0bc07e976f49ef1ad22e0e217bd5' 
  AND token = 'zqRAO0xJsWUw4aBggkpaefcMw1HJiXdgcofU7sS2cZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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