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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe41dfed52727f7bef1c3aece513a973d9b62d617d814712141ab26cba5d7811' 
  AND token = 'EPDm7Ln6wo6AiKBT8Mey/g3vzypQrk/PGoKBMmOgPCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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