SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'baccf8e6ad4c76e646823f441f6b672fe2026881791d17b84dbb3da5ea7ec363' 
  AND token = '6E/GcJzBjEXzIhYzQmYBs4uUb/LohACojb7S/+UV/Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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