SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e5226bdd9b4bc5563187b6a30f5b19bce673f3f74fe5ce8c026e80aa318ca772' 
  AND token = '/gSaZ0mY7zOmgj7uSH4rF6R5/NmBQDWnFsjqF3vzmh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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