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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '16a1d1179e46adebc3f95e1f8f8fad4f79920ac117ded8e1ede392a7bef40f23' 
  AND token = 'EtIuElipCqoFzSUfOYKVXHB1nfZYE0TtN5JSMrM2NII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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