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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '71f36cbf07d2b63d0c219eb15ebd2f2b0dcfa82dd486e95072b5a5fcbbf00af4' 
  AND token = 'odq8klEKHuXcp7hpBzKRKvCbA8fmEKeaf1QLvnQ2oM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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