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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c083840f05f6c87828dec6ab09e3b9ca13900bc81885111805d33a67c79250d7' 
  AND token = 'a0uapRkXswdczhxSooH5zIXEJxW0hAuSh6S9K2jJlGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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