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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e9ec31598960daf9c5f181af748e50412c0d46dd44eca523fada891878bc4929' 
  AND token = 'tM4mbMGw+K/EG533zktQj9s6wcan0qtOsxqL8RH1HZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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