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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '317c2f17d072ee03a26216a6fc68e79585bcb08f2ae056032d732c589002ffc8' 
  AND token = 'm3Q3y3mTco8HEqqqO8Nqvh/v1CMEKJi26H9q86nHS6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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