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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3adbd8e65ece73bfb1d4806494ac57f6078d12c639136e3e91faea048cc3b92e' 
  AND token = 'K6NZmx5SqE0/1N/IfedesfF7SjEKBW27g2dJnbnr6I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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