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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6330ff0dfe6064e49f83d986182b9691c60d1cae0a0cee7ac0eacb9ffdd978c5' 
  AND token = 's089Sn0+K0nHnf+RkPKcOOUJWVfmIiaW/Y/CVfkMJPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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