Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76ea0f7bf45e566462ff94f68722edf4c020c8a191add8eeb34140a83ff98ef' 
  AND token = 'QR8SVgufHwwTag9qJIJOk6LeHc3kcTz+PXu46HMFWRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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