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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1c40a6d1192ddd419c5c2a56079ab771f0c1827bf7ba62de6e8f7d5b626c14d6' 
  AND token = '0ENqY+gvj3fl+cS6hd3dkiuL79tGCUUxnI1pcuRU3r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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