Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ef2d573f9ef97feebc29f49a5e1a6fdb4081c2d3eda5b95809e98f4f9dd87288' 
  AND token = 'xTWytv50RsynlzMOMg9oyRGsLle68cQIBKNflr02FcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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