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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c3e5c6933200bc9fd895acc1a94ea619d7edf726ff01d07ac49a0ffbfd143fdf' 
  AND token = 'd5iF7jEX7yfj+pQQcygW8KQC+oSJrUpIag2fxpOQHXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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