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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '15224efd2109d7d03e87b46959cf2f74b6c04cfd01d6a95bc88519b5dc80e150' 
  AND token = 'yABdw7Sn5atjanMahKAyQn2Mmx/A46pdlaeK4gFGWJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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