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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4488eb608a4e119402a48a55d1dc8191e18c2699a4950db347d7250ebd8e5f50' 
  AND token = 'cWjPvOQi9iOPw6LVIhRC4+e4/+kIUfqh4wuMPsnS1ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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