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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a88efe3f99b66d8ab55feda6357e13d789c25feed6338262c3d93cc4b1ca843d' 
  AND token = '17asstx7yN1QzRjNM4Hip+2AtJHcC3KWfH++23kL/ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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