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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c63a2a799df4676d11951b8cc40892c5a1d5c60c9cfe4d9c98403b0db31a2c88' 
  AND token = 'dgbUeX4OW95gJ6W0yNV03hDc9bng7/RyF/ZO2bsMt/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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