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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '572b0e5fdfc17f3b81d9b152f215c90802b7a61ef1159bbcc88a4c2408904d11' 
  AND token = 'L2MNwbUqzJr44SA+tyw3co0QyDuDzdnF50LnUSF5PWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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