SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '28488635cb58934e44d108d11f2d9f2db119771d5c72306676dca9eb9fa78e58' 
  AND token = '+dEFvfw4hX/CCmPdzV8ZLCCbKSMMvyHzdApU3YtdkTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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