SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc2d79e6ee7ef886b96549d2041d55d55c2762362a1a44bb7aa279b3e9055ba5' 
  AND token = 'xLMhp+HZari/KCgYMDSQ/AY6rZoKnrhdG04sMCGyVrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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