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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65e2d562ac5c20c0676d84f20c885b28c2c5c192d57fe4356d6938026528fbb4' 
  AND token = 'zjKFCjtfu6YHSWXSuc+OFDiSUE50YghlMr7zNlBPRQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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