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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd6607106c34eadc5daa2888637432b6c7f5b3c136d56493590fcc9eeaa35a469' 
  AND token = '2C5tV3vf38CO51fQQ1aEAz8AuHa6XwsP3e2aVkEs7Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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