Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fb5de61683c0a815a1cbd583f4ccc9f41d3b25b8c3ae4dcc87a23b71edf334' 
  AND token = 'KeVzevvNoiLipdUVpPI3mkTLRjWKmvqHSw80D4Zz3oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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