SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '43e6227560fc0898b37c2a83283a64e918c4efbb1949d7a1259ff3411ba119e0' 
  AND token = 'XaGqR84Zrm4Vlf9RbhHiFPyMg6ILoFcMWmSPdDT7zFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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