Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d62ab5a356c50929ef113c06e5e1817a255981df1e3041c5e9421935ea434db' 
  AND token = 'Skl0T0fVx6gnc2FccxSIAASuIUVB0eofuWlLKt4qsio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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