Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d3417a18623ed79ac7c494ed64b895deca2e62126b3f6f7c42f9b51097e838' 
  AND token = 'UMgeP2FmvmSI4ff7affTdtP7RbY3FZV78kQVMJqsFdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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