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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a12d79f19d73c30ada3cdbdaa8466c41a6176d332dbee0050cbfcc7784752e8b' 
  AND token = 'ZHyDQCP0loCL5F7TtNE6m3JlGNz2z1jDEF46eF9qPT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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