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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22ec52d8505c327f00b0e9011eb97da33de01cbd002fd4ffc389bd46cfffec7d' 
  AND token = '/7D0DJBHkB7DQQRKdlJOfxKyiyW2t3GgHI4sZcUfPTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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