Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b43765645b6a00e42a0d2bb3f67a6504df5476af6c298c9dd287f2bcd8ae61c' 
  AND token = 'zdBA2QkmZEyqlpqzKunXjuK0YQNFMtqQlSdNC1QFeOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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