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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8a8505bad319884cd3b8f13e0eb9b4c0b52bf021a0b68aaed4d1e04f48fec4c0' 
  AND token = 'AUe0gyOqIXi8oxWf9wm5sQGEmiKZ9U8cenS5osaCvYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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