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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '55bf1077a612fc473930b1f96cecf94efc9fab13cad7fb65cab23199b288c5d3' 
  AND token = 'Za1tqg6nKy4TzmjLI125iE6jpeXJDElve/UOaJ8fDcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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