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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '48ad524377ccb92649d0d2fef38ab083bdc5e4554154b4793c815c42658fa821' 
  AND token = '6xOt9WVUwWJRoES/le7AoC7iz4Z59dTqIhnWw7Vg0PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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