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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '54928cf7544449aecf73b2e55afe170c619dd5ab16046385f4c428425c055dc2' 
  AND token = 'wrxoLa/UZpZy6g2iDMEP5T9pNdKI0G6AuLw6/S2Vqi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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