Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6904f63cd8ff2edffa2b475c6ddcb485e36c7b7671bbb32fdaf1dc5f887e15c' 
  AND token = 'kQkoCbcyEZqd1PPSrD3bdmtUcZaFeM/huLTR3ji5qZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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