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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'da5546bd388c8d6c55f3d0b6a9ed6c6a1bdda33db8e7354da5538eda96ec7936' 
  AND token = '/UOv6dNtDhBlpfu3kqXL/9VKSF5E5LVxFeWAyOAuOKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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