SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f7fdefaf8a1ad742888057d05a22e3b1ef70eb89ce215109558d16ec461b22eb' 
  AND token = '0Z9//zrZQCCJTNHFOcq7nJKwYl+7VY75b6OkZaAYeMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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