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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1fd88acc26a5488910026b4668cf0d00c50b1082f559eefb6b49bcc2f6dfe95b' 
  AND token = '3u0zDUDf0EKxkHUJO8myG0sgozstAhcjJuaFuZ/GJyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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