Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e755ff0e7fa17ba8204dd5ebdbe1e2d3553eae1edc39f3a56f846d418752d3' 
  AND token = 'RslqkZZA3JJJl2xV2MkxDbe2knawZ5JqIL2zTsXB9Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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