Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec9a98b9a30c27ab31c3c17eb3bbcb4db78a3a5adedf52f5ca763d1e91dabba' 
  AND token = 'fS5/4Lc9FN8+6KkPHC3NJxklYmwJ0gZW5HRwDBV1hXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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