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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '731b08fe62adbcd6fb288722c5a186cc8d187585822264605bf703c7dd7e8396' 
  AND token = '5kNs39xJVAdX7doPjJcpr/9K5PpZl25MgaKF6zNjxyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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