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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d92a2f63dc15ad2df0de1465f50077376fac4e7dba4b1d2f6d0636f7aad3bdf' 
  AND token = 'i9p4SeOpweLkig1h49/OO9Yt8AXn+d1XFf5fiMS4izY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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