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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '830e77d0a4f86566a76bd85dd5c63fdf3660cce021b15da76147551dff38ba64' 
  AND token = 'cABZ4P6w/u/fic81GjkWBnvD0oi86SqDSLkjv7TY/E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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