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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ee7a26a92489233eeeea427cf0aa5fd3a8577307b49436a36a4efc30bea8c519' 
  AND token = 'DHfkE7wRWKOMjkLw8snZIJ4jsiuZykKFBGRYzmJdcY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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