SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d105a799e3f407472a24a44d8881fdd24c1f1bb7c296b97bc5e3e3b0b0cc10b' 
  AND token = 'pHwq2pdXnEvzpvLJeFZouriFadj5TYO/LrhXN0/I1A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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