Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94315843ffda897b122864916d6a389576cae31ce478df1aec337e12aaecde6b' 
  AND token = 'bxyAcvPyv2RLCMOt7DrFONdtx65ZkcYGo1dxnTU1Olc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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