SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7a797b25b0c78c8f2eaf62dd5a3bd786479ade150364d36a2fb445f1623862ee' 
  AND token = 'QBQEUVXhS1DduvHMcGG44gv24zHw47DGAZ3tXkJizxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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