Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015ce7eb1ea34cea55d22752198148dd222237b85042d1078d538dd34783d1a2' 
  AND token = 'HI1tHru2JTGHUd+w52DKZWmeZsRBUCliiTex0voVOnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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