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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3845f93cfef376324cc909154e789f7bb6cb5a4fb3c24da622e2c0d1c2d98604' 
  AND token = '6TZt9Li+uiH+dLdWg7Qyh5RWVRrnk5gMR/89AdpBaS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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