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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '383a9f4d9f975eb24b7ddb069f7b1453fca7718a7296f156f11b7fb9908662b6' 
  AND token = 'poR8Or7QkyqjPnji2S6kymY8sapznvYkx7yvUg1Nm7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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