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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8d518a08ae227cc717d736fff1bf4ba4bedca07a74f69973f82096b8a5ae2ac3' 
  AND token = 'RQpVvgSr6AqdNaloxHaRCW52tTZbQf9pAP93WgY6N5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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