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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69cf7d40dc14e7e1b1dbbf740832a86a5c903d5cba563db76704dcaa1e3eae3a' 
  AND token = 'LRKjLWP6888MqPT4dO23Xr4fYCekRwe2oKIVS+0pbRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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