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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5095bdc8c3b6b324bb379fa16fe7ef51e263d36613da74e5dc3f1c51cb2c1b82' 
  AND token = 'H8/1he5rq1d1VeIgmSf93Ca0NW5BNehvTJrAB5MJ1tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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