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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5a3a29401d12d5c1b2d2b7c4e224e953be2fb9dde09b1d1b1ad155e0fb14deef' 
  AND token = 'WQ88v784y5a3UZxT/PQ6IXKj0g2MpxuO4liCm1VJqz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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