Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb0fbb08f08bc892bcd59a3d3c3f47a3abba4a8ff21411628341390ddb0b653' 
  AND token = 'jk4jI/uTKLC8scJfy9Y57+fdTvCuRFPdWC4fh5GubaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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