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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ddff05fb9cad11ee4309448f870511b60f860ecbf79e67b49e445a1885f110bb' 
  AND token = '3ciGhxc866kaM7C51+akx6ayGsAKi+97KTEymuAyK3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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