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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2f05d5146adeef73d0f6c138b7f797680e1bcf6cdda1d8ce3fed05f5af87d25e' 
  AND token = 'K26USbVNXWWxnsQn5lAIyhtg+GzeiRLOCA7sTpviypY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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