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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b3734864bb0b68a8a7ed532e2eadd40ff823342ff03d93f8228b5bd26a560197' 
  AND token = 'dW+7PwCt2YdrQuOTnGoGYQTFONYQmdI3ESPmU/LOUPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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