Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9861be3a43076c1e5201e35b1992e0b2d541200bd15125e2b1e29f965d3c32a2' 
  AND token = 'hlSmbE87spu+3tyXUo40dWwcDJljNkhMheGufJIeZ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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