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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2ef0403b713f1f9f1cdb9ac19612bc3cd71615667fd604ee90fc3995a141e860' 
  AND token = 'PTxttrFvHJFhY28Ew9LFQQtIWWOFiTgOSjkzi/J1LbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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