Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726e82c2718286193f557cdaa6032b10d66baa4285cec5291803be665dd39548' 
  AND token = 'b+9L7ACtWFTLNme2h5HELIJqdwHHw1A7Oe3ZKNlSBvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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