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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '19540f0bb7ae667b0f0a2b9f54148135f1eca987c52fbdf93b3b84fa78c35e33' 
  AND token = 'WnFCCuKkltWulDc9WVO8Nb3H89CfXznFWcgtMi/QAlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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