Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e266d3b6640a24f8a1e463e4e3a7ff8f692f533636640e2a16be78cc9e880cb3' 
  AND token = 'dmVL6M+nj4O4iPj9stR8FGgZbQ3WDSsL2Bs8Dboqvas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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