Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7caddeb9e2a384c55efdc8e47ee145b9fb78e1cdfe5283fa4a4f2cebb75990f' 
  AND token = 'br/2Ja8Yket5ZGcaz6SDWtW5S0w9rlPDylox6Rf36Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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