SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '775b27f23948ef8614a49e0d1e642486e627b3fcf572066a88b154d99e00300d' 
  AND token = 'iV5vSXD6Lg2BFwjVZmGhya4XqjCErWpsIcSImFgr608=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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