SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2bea77130709033d89c1068ef39bdb878b72b36c521179324a3e6cabb9f38a69' 
  AND token = 'b8VvqOVyRxIxB6CINxvNnR4o82jw9dDHHiXGoN/qzxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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