Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ae85a0e717b61184551432e842976429548b519044a018ffa1c3b229c11716' 
  AND token = 'c4tzIFedq3/1HMCyZBGaiZfeRShMPV9Xf6oRpfozHTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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