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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9dc8f624376c29a5f9239d97d53c3cdff15807cb807508f6049a54fc495bf404' 
  AND token = 'XzsCXrH7Ld5o2gCaH1ovSQnvO10gbSIN1pjoMYgHa/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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