Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36370b1ec769d57f377f5eced8e39549d178630a123429fc405a631b26ec4e9' 
  AND token = 'fGMNUVjtI12zZSqf3pCHf87jbS383N+j40CtyMs1p0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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