SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4c663d667c7ff1693edade1a057d542f1d624487a93d2300185c2e84aa7c9bc4' 
  AND token = 'pcJsu382FxffHANZHjXlBBX+OgLK8Byi7OTiJq6xOsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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